This replica of the Greek structure is in the heart of Nashville.

The world's longest known cave system.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

These pretty kitties killed and ate as many as 135 railway workers.

A goddess-topped water fountain in Chicago was created thanks to the dreams of a thirsty newsboy.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This historic hotel invented the chocolate brownie.

The iconic Chicago sculpture hides a beautiful and easily overlooked plaque on the backside.

G.V. Black, the Father of Modern Dentistry, keeps an eternal eye on Chicagoan’s teeth from his perch in Lincoln Park.

The palatial McDonald's that inspired Wesley Willis.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Home to a protest movement, a bombing, and a dramatic change in labor history.

A strange and haunting monument of unknown origin in the historic Graceland Cemetery.

An enormous park-like oasis, full of famous Chicagoans' graves.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

A science teacher's dream.

Shop of curiosities with a dinosaur museum tucked in its basement.